unexpected response when trying to concatenate by row after accessing cell value

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Thomas
Thomas 2024-11-26
编辑： Stephen23 2024-11-26
I am trying to access the values in certain cells then concatenate the results together by row :
% initialise cell data for example
cells = cell(5, 1);
cells{1, 1} = [5 1];
cells{2, 1} = [4 1];
cells{3, 1} = [3 1];
cells{4, 1} = [2 1];
cells{5, 1} = [1 1];
% the code im trying to run
all_cells = [cells{1:5, 1};];
the result i get: 1x10 matrix [5,1,4,1,3,1,2,1,1,1]
what i am expecting to happen:
% my current workaround
cell_1=cells{1, 1};
cell_2=cells{2, 1};
cell_3=cells{3, 1};
cell_4=cells{4, 1};
cell_5=cells{5, 1};
y_folds = [cell_1; cell_2; cell_3; cell_4; cell_5;];
the result i expected: 5x2 matrix [5,1;4,1;3,1;2,1;1,1]
i also tried to use comma instead of semi-colon as such:
all_cells = [cells{1:5, 1},];
but i get the same result as with a semi-colon: 1x10 matrix [5,1,4,1,3,1,2,1,1,1]

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采纳的回答

Stephen23
Stephen23 2024-11-26
编辑：Stephen23 2024-11-26
Ran in:
The MATLAB approach is to simply call VERTCAT instead of the concatenation operator:
C = {[5,1];[4 1];[3 1];[2 1];[1 1]};
M = vertcat(C{:})
M = 5×2
5 1 4 1 3 1 2 1 1 1
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Explanation of how this works:
https://www.mathworks.com/matlabcentral/discussions/tips/847976-tutorial-comma-separated-lists-and-how-to-use-them
The trailing semi-colon or comma in your code attempts do nothing whatsoever.

更多回答（1 个）

Thomas
Thomas 2024-11-26
编辑：Thomas 2024-11-26
this gives the correct answer
cells = cell(5, 1);
cells{1, 1} = [5 1];
cells{2, 1} = [4 1];
cells{3, 1} = [3 1];
cells{4, 1} = [2 1];
cells{5, 1} = [1 1];
all_cells = [cell2mat(cells(1:5, 1));];
the result: 5x2 matrix [5,1;4,1;3,1;2,1;1,1]

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